In the Jahn-Teller-Hubbard molecule, conventional quadrupoles vanish but composite two-body electron-phonon quadrupoles emerge that are selection-rule decoupled from them, and the ground-state entanglement involves phonon angular momenta L_ph=2,3 superposed with electron L=1,2 states.
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Resonant x-ray scattering shows three-dimensional zigzag correlations persisting above TN in RuBr3, stabilized by enhanced interlayer magnetic interactions from extended Br 4p orbitals.
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Spherical-tensor description of the Jahn--Teller--Hubbard molecule and local electron--phonon entanglement
In the Jahn-Teller-Hubbard molecule, conventional quadrupoles vanish but composite two-body electron-phonon quadrupoles emerge that are selection-rule decoupled from them, and the ground-state entanglement involves phonon angular momenta L_ph=2,3 superposed with electron L=1,2 states.
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Three-dimensional zigzag correlations in the van der Waals Kitaev magnet RuBr$_3$
Resonant x-ray scattering shows three-dimensional zigzag correlations persisting above TN in RuBr3, stabilized by enhanced interlayer magnetic interactions from extended Br 4p orbitals.